Universal glue overflow prevention main nozzle for cold runner and hot runner

Abstract

The utility model discloses a universal glue overflow prevention main nozzle for cold and hot runners. The universal glue overflow prevention main nozzle comprises a main nozzle main body, the valve core supporting seat is arranged in the main nozzle main body; the valve element comprises a head, a main rod body and a guide rod which are sequentially arranged in the axis direction, a plugging block used for sealing the glue inlet hole is arranged on the head, the main rod body is sleeved with a spring, a plurality of limiting blocks arranged in the circumferential direction are arranged on the inner wall of the valve element supporting seat, step faces are arranged on the limiting blocks, and the ends of the limiting blocks make contact with the side wall of the guide rod. One end of the spring is contacted with the head and the opposite end is contacted with the step surface; the main injection nozzle cap is in threaded connection in the main injection nozzle main body, the bottom of the main injection nozzle cap is in contact with the valve element supporting seat, and the glue inlet hole is formed in the main injection nozzle cap. Compared with the prior art, the glue overflowing problem caused by the fact that the valve element is not reset in place is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of main nozzles of injection molding machines, in particular to a universal anti-overflow glue main nozzle for hot and cold runners. Background Art

[0002] The main nozzle is a component of the cold runner system. During injection molding, the nozzle of the injection molding machine docks with the discharge port of the main nozzle. For example, Chinese patent CN203567011U discloses a self-sealing main nozzle, which relates to a hot runner system of an injection mold. It includes a cylindrical heating ring, a sealing rod, a main nozzle body, a positioning retaining ring, a compression spring, a sealing shuttle and a main nozzle base. The second slope is in close contact with or out of contact with the first slope due to the compression and reset of the compression spring caused by the compression or release of the positioning retaining ring, and the advance and retreat of the sealing rod; the second slope is out of contact with the first slope, the ejection hole is opened to eject the molten rubber material in an injection state, the second slope is in close contact with the first slope, and the ejection hole is blocked in a self-sealing state.

[0003] In the existing main nozzle structure, the valve core is reset by a spring. Since the valve core stroke lacks a limit, the spring deforms greatly, resulting in the valve core not being able to fully reset when used for a long time, which easily leads to glue overflow. Utility Model Content

[0004] The purpose of the utility model is to provide a universal anti-overflow glue main nozzle for hot and cold flow channels, so as to solve the glue overflow problem caused by the incomplete resetting of the valve core.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a universal anti-overflow glue main nozzle for hot and cold runners, comprising:

[0006] Main nozzle body;

[0007] A valve core support seat is placed in the main nozzle body;

[0008] The valve core includes a head, a main rod and a guide rod arranged in sequence along the axial direction. The head is provided with a blocking block for closing the glue inlet hole. The main rod is sleeved with a spring. A plurality of circumferentially arranged limit blocks are provided on the inner wall of the valve core support seat. The limit blocks are provided with a step surface. The end of the limit block contacts the side wall of the guide rod. One end of the spring contacts the head, and the other end contacts the step surface.

[0009] The main nozzle cap is threadedly connected to the main nozzle body, the bottom of the main nozzle cap contacts the valve core support seat, and the glue inlet hole is set on the main nozzle cap.

[0010] As a further description of the above technical solution:

[0011] A guide portion is provided on the top of the blocking block, and the guide portion is a truncated cone structure that is narrow at the top and wide at the bottom.

[0012] As a further description of the above technical solution:

[0013] A chamfered surface is provided on the end of the glue inlet hole facing the valve core.

[0014] As a further description of the above technical solution:

[0015] Three circumferentially arranged limit blocks are provided on the inner wall of the valve core support seat.

[0016] As a further description of the above technical solution:

[0017] The end of the limiting block is provided with an arc surface whose shape matches the side wall surface of the guide rod.

[0018] As a further description of the above technical solution:

[0019] An annular groove is provided on the outer wall of the main nozzle body.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] In this utility model, one side of the main nozzle cap serves as the injection port, connected to the injection equipment. During injection, the injection pressure pushes the valve core, which compresses the spring and opens the main nozzle. The rubber enters the main nozzle body through the inlet port, passes through the valve core support seat, and exits the other end of the main nozzle body. After injection, the spring force resets the valve core, and a blocking block is inserted into the inlet port, sealing it and preventing the rubber from escaping.

[0022] 2. In the present invention, when the main nozzle is opened, the stroke of the valve core is limited by the step surface on the valve core support seat. When the bottom end of the main rod body rests on the step surface, the stroke of the valve core reaches the maximum, effectively controlling the stroke of the valve core and the deformation of the spring, thereby effectively ensuring that the valve core can be reset to its original position when the main nozzle is used for a long time, effectively blocking the glue inlet hole and preventing glue from overflowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural diagram of a universal anti-overflow glue main nozzle for hot and cold runners.

[0025] Figure 2 This is a schematic diagram of the structural breakdown of a universal anti-overflow glue main nozzle for hot and cold runners.

[0026] Figure 3 This is a cross-sectional view of a universal anti-overflow glue main nozzle for hot and cold runners.

[0027] Figure 4 This is a structural diagram of the main nozzle body in a universal anti-overflow glue main nozzle for hot and cold runners.

[0028] Figure 5 This is a cross-sectional view of the main nozzle cap in a universal anti-overflow main nozzle for hot and cold runners.

[0029] Legend:

[0030] 1. Main nozzle body; 11. Ring groove; 2. Valve core support seat; 21. Limit block; 211. Step surface; 3. Valve core; 31. Head; 311. Blocking block; 32. Main rod body; 33. Guide rod; 34. Spring; 4. Main nozzle cap; 41. Glue inlet hole; 411. Chamfered surface. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1-5 The utility model provides a technical solution: a universal anti-overflow glue main nozzle for hot and cold runners, comprising:

[0034] Main nozzle body 1;

[0035] The valve core support seat 2 is placed in the main nozzle body 1;

[0036] The valve core 3 includes a head 31, a main rod 32, and a guide rod 33 arranged in sequence along the axial direction. The head 31 is provided with a blocking block 311 for closing the glue inlet hole 41. The main rod 32 is sleeved with a spring 34. A plurality of circumferentially arranged limit blocks 21 are provided on the inner wall of the valve core support seat 2. The limit blocks 21 are provided with a stepped surface 211. The end of the limit block 21 contacts the side wall of the guide rod 33. One end of the spring 34 contacts the head 31, and the other end contacts the stepped surface 211.

[0037] The main nozzle cap 4 is threadedly connected to the main nozzle body 1 , the bottom of the main nozzle cap 4 contacts the valve core support seat 2 , and the glue inlet hole 41 is provided on the main nozzle cap 4 .

[0038] Three circumferentially arranged limit blocks 21 are provided on the inner wall of the valve core support seat 2 to fully position the guide rod 33 on the valve core 3 and facilitate the passage of the rubber material.

[0039] The end of the limiting block 21 is provided with an arc surface whose shape matches the side wall surface of the guide rod 33 to effectively position the guide rod 33.

[0040] Working Principle: One side of the main nozzle cap 4 is the injection port, connected to the injection equipment. During injection, the injection pressure pushes the valve core 3 to compress the spring 34, opening the main nozzle. The rubber enters the main nozzle body 1 through the injection hole 41, passes through the valve core support seat 2, and flows out of the other end of the main nozzle body 1. After injection, the valve core 3 returns to its original position under the elastic force of the spring 34, and the blocking block 311 is inserted into the injection hole 41, sealing the hole 41 and preventing the internal rubber from overflowing.

[0041] When the main nozzle is open, the travel of the valve core 3 is limited by the stepped surface 211 on the valve core support seat 2. When the bottom end of the main rod 32 abuts the stepped surface 211, the travel of the valve core 3 reaches its maximum. This effectively controls the travel of the valve core 3 and the deformation of the spring 34, thereby ensuring that the valve core 3 can be reset to its original position during long-term use of the main nozzle, effectively sealing the glue inlet 41 and preventing glue from overflowing. In addition, the valve core support seat 2 is squeezed and fixed within the main nozzle body 1 by the main nozzle cap 4, simplifying the installation structure and facilitating the replacement of the valve core support seat 2.

[0042] Example 2

[0043] This embodiment further improves upon the above embodiment by providing the following technical solutions: a guide portion is provided on the top of the blocking block 311. The guide portion is truncated and narrow at the top and wide at the bottom. The guide portion allows the valve core 3 to be guided when it is reset even if it deviates, ensuring that the blocking block 311 is inserted into the glue inlet 41 and effectively blocks the glue inlet 41.

[0044] The end of the glue inlet 41 facing the valve core 3 is provided with a chamfered surface 411 to further prevent the blocking block 311 from colliding with the glue inlet 41 and being damaged, making it easier to guide the blocking block 311 into the glue inlet 41.

[0045] Example 3

[0046] This embodiment further provides the following improved technical solutions based on the above embodiments: an annular groove 11 is provided on the outer wall of the main nozzle body 1 to facilitate clamping and fixing the main nozzle body 1, thereby facilitating separation of the main nozzle body 1 and the main nozzle cap 4.

[0047] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A universal anti-overflow glue main nozzle for hot and cold runners, characterized by: include: Main nozzle body; A valve core support seat, which is placed in the main nozzle body; The valve core comprises a head, a main rod and a guide rod arranged in sequence along the axial direction, the head being provided with a blocking block for closing the glue inlet hole, the main rod being sleeved with a spring, the inner wall of the valve core support seat being provided with a plurality of circumferentially arranged limit blocks, the limit blocks being provided with a stepped surface, the end of the limit block contacting the side wall of the guide rod, the spring contacting the head at one end and the opposite end contacting the stepped surface; The main nozzle cap is threadedly connected to the main nozzle body, the bottom of the main nozzle cap contacts the valve core support seat, and the glue inlet hole is arranged on the main nozzle cap.

2. A universal anti-overflow glue main nozzle for hot and cold runners according to claim 1, characterized in that: A guide portion is provided on the top of the blocking block, and the guide portion is in a truncated cone-shaped structure that is narrow at the top and wide at the bottom.

3. The universal anti-overflow glue main nozzle for hot and cold runners according to claim 1, characterized in that: The end portion of the glue inlet hole facing the valve core is provided with a chamfered surface.

4. The universal anti-overflow glue main nozzle for hot and cold runners according to claim 1, characterized in that: The inner wall of the valve core support seat is provided with three circumferentially arranged limit blocks.

5. The universal anti-overflow glue main nozzle for hot and cold runners according to claim 1, characterized in that: The end of the limit block is provided with an arc surface whose shape matches the side wall surface of the guide rod.

6. The universal anti-overflow glue main nozzle for hot and cold runners according to claim 1, characterized in that: An annular groove is provided on the outer wall of the main nozzle body.

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